Suppose you have a work policy where all calendar and related stuff is automatically deleted when it beomes a year old.

Currently, I think it is useful to look back more than a year.
But hey, I am new to GTD. What do you think? Should I try to set up my GTD system within these one-year constraints, or should I set it up on my home computer, and still run some of the system at work, where we use the Calendar as groupware to schedule meetings etc.